This commit links together all the individual pom.xml files to have a
new "impala-parent" pom as the parent. This enables de-duplicating all
the repository configuration.
I ran the build to test this.
Change-Id: Id744e4357ee4d8e4be4e5490b2159bb76a2192f0
Reviewed-on: http://gerrit.cloudera.org:8080/8753
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: Impala Public Jenkins